KR101669131B1 - A radioactive liquid waste treatment system - Google Patents

A radioactive liquid waste treatment system Download PDF

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Publication number
KR101669131B1
KR101669131B1 KR1020160008712A KR20160008712A KR101669131B1 KR 101669131 B1 KR101669131 B1 KR 101669131B1 KR 1020160008712 A KR1020160008712 A KR 1020160008712A KR 20160008712 A KR20160008712 A KR 20160008712A KR 101669131 B1 KR101669131 B1 KR 101669131B1
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KR
South Korea
Prior art keywords
waste liquid
evaporation
liquid waste
evaporation vessel
tank
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KR1020160008712A
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Korean (ko)
Inventor
조항래
김정주
이지훈
박승철
Original Assignee
한국수력원자력 주식회사
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/04—Treating liquids
    • G21F9/06—Processing
    • G21F9/08—Processing by evaporation; by distillation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • F25B41/046—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/044—Condensers with an integrated receiver
    • F25B2339/0441—Condensers with an integrated receiver containing a drier or a filter

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

The present invention relates to a system for evaporating and drying radioactive liquid waste capable of stably operating evaporation by circulating liquid waste in a heater of a container and an inside of the container and heating the same when the liquid waste is evaporated. The system for evaporating and drying the radioactive liquid waste comprises: a liquid waste supplying water tank which stores the radioactive liquid waste; an evaporation container which evaporates and dries the radioactive liquid waste; a liquid waste supplying flow channel which is positioned between the liquid waste supplying water tank and the evaporation container, and includes a liquid waste supplying pump; a heater which is installed on one side of the evaporation container; and a liquid waste circulating flow channel which is positioned between the evaporation container and the heater, and includes a liquid waste circulating pump circulating the radioactive liquid waste of the evaporation container in the heater and the evaporation container. The liquid waste supplying water tank and the evaporation container are installed in a storage tank. A collecting water groove, which collects the radioactive liquid waste leaking from the liquid waste supplying water tank and the evaporation container, is formed in the storage tank. The system for evaporating and drying the radioactive liquid waste comprises: a liquid waste collecting flow channel which is installed between the collecting water groove and the liquid waste supplying water tank; a water gauge which measures a water level of the collecting water groove; and a liquid waste collecting pump which collects the radioactive liquid waste of the collecting water groove through the liquid waste collecting flow channel when the water level exceeds a constant water level through measurement of the water gauge.

Description

Technical Field [0001] The present invention relates to a radioactive liquid waste treatment system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radioactive waste liquid evaporation and drying system, and more particularly, to a radioactive liquid waste evaporation and drying system in which radioactive liquid waste can be evaporated while circulating a vapor container and a heater outside the vapor container.

Nuclear fuel refers to a substance that is charged into a nuclear reactor to produce a chain of fissionable energy to obtain available energy. Radioactive waste is a substance that necessarily occurs in the process of using nuclear fuel. Radioactive waste can be divided into solids, liquids and gases.

Two radioactive liquid wastes contain several percent of non radioactive material (dust, soil, sludge, synthetic detergent, oil, etc.) and radioactive materials (Ag, Fe, B, Si, Mg, Ca, Al, Ti, S, Na, K, etc.) are generated in laboratory system, laundry wastewater, system decontamination water, floor drainage.

Such radioactive liquid wastes will inevitably occur due to the use of nuclear power generation, nuclear fuel cycle facilities and radioactive isotopes, and must be safely treated and managed so that they will not be harmed for a long period of time.

At this time, the treatment for the radioactive liquid waste is evaporated and concentrated for volume reduction.

The evaporation concentrating treatment system for such radioactive liquid wastes is not only a large facility but also a small concentration waste liquid evaporator drier which is manufactured by a liver transplant using a band heater is also used.

At this time, the conventional small concentrated liquid waste liquid evaporator has the following problems.

First, the band heater type small evaporation dryer is advantageous in that it can be constructed in a compact manner because evaporation and drying are performed together in a single vessel. However, since concentrated waste liquid in the vessel is not circulated and is heated in a static state, It is possible to cause carryover or Dolby phenomenon.

Accordingly, there has been a problem that the flow rate of the evaporation treatment is decreased as compared with the designed capacity as the heat output of the band heater is lowered to prevent the carryover and the Dolby phenomenon.

In other words, there has been a problem that the efficiency of equipment operation is deteriorated due to the above-described problem.

Secondly, the concentrated waste liquid in the container is not circulated and is heated in a static state. Therefore, due to the band heater installed in the container in the portion where the level of the waste liquid does not reach, fine deformation may occur in the container during decompression operation or long- , Which leads to a problem that the mechanical life of the container is shortened.

Third, since the method for controlling the level of the waste water in the container is simple on / off method, the evaporation process is stable since the waste liquid is intermittently supplied to the inside of the container according to the level of the waste water, There is a problem that the evaporation flow rate temporarily decreases.

Fourth, since the water level meter for measuring the level of the waste water in the container is provided in the float type, there is a problem that the water level is interfered with the water level meter when using for a long period of time.

Korean Patent No. 10-0675769

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide an apparatus and a method for circulating a radioactive waste solution through a circulation pump and a heater, And to provide a system for evaporating and drying a radioactive liquid waste so that operation can be performed stably without occurrence of a phenomenon.

According to an aspect of the present invention, there is provided a waste liquid supply system including a waste liquid supply tank in which a radioactive waste liquid is stored, an evaporation container in which a radioactive waste liquid is evaporated and dried, And a waste liquid circulation channel provided between the evaporation vessel and the heater and circulating the radioactive waste liquid in the evaporation vessel to the heater and the evaporation vessel, Wherein the waste liquid supply tank and the evaporation container are installed in a storage tank and a collection groove is formed in the storage tank for collecting the radioactive waste solution that has leaked from the waste liquid supply tank and the evaporation container rotor and is disposed between the collection groove and the waste liquid supply tank; A water level meter for measuring the water level of the collection groove; a water level meter for measuring a water level, And a waste liquid recovery pump for recovering the radioactive waste liquid in the collection groove through the waste liquid recovery tank.

At this time, a pressure regulating passage is provided between the waste liquid supply passage and the waste liquid supply tank, and a valve for controlling the amount of opening and closing of the pressure regulating passage is provided in the pressure regulating passage.

Preferably, a heat exchanger for exchanging the temperature of the radioactive waste liquid supplied from the waste liquid feed water tank is further provided on the waste liquid feed passage.

At this time, it is preferable that a steam energy recovery flow path is provided between the heat exchanger and the evaporation container, and the heat exchange action of the heat exchanger is performed using high temperature steam supplied through the steam energy recovery flow path.

A condenser provided at one side of the evaporation vessel, a steam supply channel provided between the condenser and the heat exchanger, the steam supply channel providing a channel through which heat-exchanged steam is introduced into the condenser, a discharge channel through which the condensed water generated from the condenser is discharged, .

The condenser water circulation passage includes a condensate water tank connected to the discharge passage, a condensate water circulation pump connecting the condensed water tank and the discharge passage and circulating the condensate water in the condensed water tank, an aspirator provided in the discharge passage and the condensate circulation passage, : ≪ / RTI >

It is preferable that the evaporation vessel is provided with a radar type water level meter for measuring the level of the radioactive waste liquid.

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It is preferable that a band heater is installed below the outer circumferential surface of the evaporation vessel.

The radioactive liquid waste evaporation and drying system according to the present invention has the following effects.

First, the waste liquid in the evaporation vessel is circulated through the heater and the evaporation vessel provided outside the evaporation vessel, and the evaporation operation is performed through the band heater installed at the lower side of the outer side of the evaporation vessel, It is possible to prevent a Dolby phenomenon or a carryover phenomenon that may occur.

Thereby, the system operation can be stably performed.

Secondly, since the waste liquid is heated while being in direct contact with the heater, the efficiency of heat transfer is improved and the efficiency of the evaporation of the waste liquid can be enhanced.

That is, the heating by the direct method is performed instead of the heating by the indirect method, so that the efficiency of heat transfer to the waste liquid is increased, the evaporation processing time is shortened, and the workability is improved.

Third, since the heater installed outside the evaporation vessel can be provided only under the outer circumferential surface of the evaporation vessel, the evaporation vessel can be deformed even during decompression operation or long-term operation to prevent the mechanical lifetime from being shortened There is an effect that can be.

Fourth, since the flow rate of the waste liquid supplied to the evaporation vessel and the flow rate of the condensed water discharged through the condenser can correspond to each other through the pressure control of the pressure regulating passage, the steam energy is recovered by the heat exchanger, There is an effect that the preheating of the waste liquid can be stably performed.

Further, since the flow rate of the waste liquid container in the evaporation vessel can be maintained constant, the temperature of the waste liquid in the evaporation vessel is not changed due to the additional supply of waste liquid, so that the evaporation operation can be stably performed.

Fifth, the water level meter for measuring the level of the wastewater in the evaporation vessel is provided in a radar manner, so that the water level measurement can be performed without direct contact with the waste liquid.

Accordingly, it is possible to prevent errors in the water level measurement due to the formation of foreign substances and scales in the water level meter, and it is easy to maintain the water level meter.

Sixth, by using the condensate circulation generated from the condenser, depressurization operation is performed inside the evaporation container, noise can be prevented, and energy efficiency can be improved.

Seventh, the waste liquid supply tank and the evaporation container are installed in the storage tank, and the storage tank is provided with a waste liquid recovery pump for recovering the waste liquid leaked from the waste liquid supply tank and the evaporation container to the waste liquid supply water tank, thereby preventing the radioactive waste liquid from leaking to the outside There is an effect that can be done.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a system for vaporizing and drying a radioactive liquid waste according to a preferred embodiment of the present invention; FIG.

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of a term in order to describe its invention in the best possible way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Hereinafter, a system for evaporating and drying a radioactive liquid waste according to a preferred embodiment of the present invention will be described with reference to FIG.

The radioactive liquid waste evaporation and drying system has a technical feature that the radioactive waste liquid can be evaporated in the evaporation vessel while circulating through the heater and the evaporation vessel outside the evaporation vessel.

Accordingly, it is possible to prevent the dolby phenomenon and the carry over phenomenon in the evaporation vessel, so that the waste liquid evaporation operation of the system can be stably performed.

The waste liquid evaporation and drying system for this purpose includes a storage tank 100, a waste liquid supply tank 200, an evaporation container 300, a waste liquid supply passage 400, a heater 500, a waste liquid circulation passage 600 A condenser 700, a condensed water tank 800, and a condensed water circulating flow path 900.

The storage tank 100 functions to prevent the waste liquid, which may leak from each equipment, from leaking to the outside during the waste liquid evaporation operation, and constitutes a bottom portion of the system.

At this time, the storage tank 100 includes a bottom surface 110 and a step 120 formed at the edge of the bottom surface 110. Even if the waste liquid is leaked, the storage tank 100 is clogged by the step 120, As shown in Fig.

At one side of the bottom surface 110 of the storage tank 100, a recessed groove 111 is formed.

The collecting grooves 111 are spaces in which the waste liquid leaking to the bottom surface 110 is collected.

The bottom surface of the storage tank 100 may be inclined toward the collection groove 111 so that the waste liquid can be easily collected into the collection groove 111.

At this time, the water collecting groove 111 is provided with a water level gauge 112 for measuring the water level of the waste liquid collected in the collecting groove 111.

A waste liquid collecting pump 130 for collecting the waste liquid collected in the collecting grooves 111 into the waste liquid supplying water tank 200 is provided at one side of the collecting grooves 111 and is connected to the waste liquid collecting pump 130, 200, a waste liquid recovery flow path 140 is provided.

The waste liquid supply water tank 200 serves to supply the waste liquid from the radioactive waste liquid generating source and store the waste liquid to the evaporation container 300 and is installed at a side of the bottom surface 110 of the storage tank 100.

Next, the evaporation vessel 300 is configured to evaporate the waste liquid supplied from the waste liquid supply water tank 200, and is installed at one side of the waste liquid supply water tank 200.

In addition, a plurality of band heaters 310 for drying the evaporation residue are provided below the outer circumferential surface of the evaporation vessel 300.

In addition, a discharge unit 320 is installed at a lower portion of the evaporation vessel 300 to discharge residual substances such as evaporated and remaining solids.

A water gauge 330 for measuring the level of the waste water in the evaporation vessel 300 is installed on the upper portion of the evaporation vessel 300. The water level gauge 330 is preferably provided in a radar system.

This is to increase the accuracy of the water level measurement by minimizing the occurrence of malfunctions in the water level meter 330 by allowing the water level of the waste water to be measured without direct contact with the waste water level.

On the other hand, the evaporation vessel 300 is further provided with a solids peeling apparatus 340.

The solids exfoliating device 340 serves to remove the adsorbed solids on the inner surface of the evaporation vessel 300 during the evaporation process in the evaporation vessel 300.

That is, the solids peeling apparatus 340 separates the adsorbed solids on the inner surface of the evaporation vessel 300, thereby increasing the heat transfer efficiency of the band heater 310, thereby reducing energy consumption and enhancing the evaporation and drying effect.

The solids peeling apparatus 340 includes a driving unit 341, a rotating shaft 342 rotated by the driving unit 341, and a peeling blade 343 provided around the rotating shaft 342.

The driving unit 341 includes a motor and is installed at an upper portion of the evaporation vessel 300.

The rotary shaft 342 is axially coupled to the motor and is installed inside the evaporation vessel 300.

It is preferable that the peeling blade 343 is installed around the rotating shaft 342 and can be closely attached to the inner surface of the evaporation vessel 300.

That is, since the peeling blade 343 closely contacts the inner surface of the evaporation vessel 300 by the rotation of the rotation shaft 342, the solid matter adsorbed on the inner surface of the evaporation vessel 300 flows into the inner surface of the evaporation vessel 300 As shown in FIG.

It is preferable that a torque meter 341a is installed on the rotary shaft 342 of the driving unit 341.

This is intended to be used as an important factor for determining the end point of the evaporation operation and the drying operation by measuring the rotational load of the peeling blade 343 continuously and accurately.

The waste liquid supply passage 400 provides a channel through which the waste liquid of the waste liquid supply tank 200 is sent to the evaporation container 300 and is disposed between the waste liquid supply tank 200 and the evaporation container 300.

The waste liquid supply passage 400 is provided with a valve 410 for opening and closing the pipeline, and a flow meter 420 for checking the flow rate of waste liquid passing through the pipeline is provided.

At this time, the waste liquid supply passage 400 is provided with a heat exchanger 430 for preheating the waste liquid.

The heat exchanger 430 enhances the efficiency of the evaporation operation by reducing the temperature of the waste liquid before the waste liquid flows into the evaporation vessel 300, thereby reducing energy consumption for evaporating the waste liquid.

At this time, the thermal energy for heat exchange of the waste liquid collects the high-temperature steam generated when evaporating the waste liquid in the evaporation vessel 300, and uses it.

For this, a vapor energy recovery flow path 440 is provided between the upper part of the evaporation vessel 300 and the heat exchanger 430.

A waste liquid supply pump 450 is installed in the lower portion of the waste liquid supply passage 400 to pump the waste liquid from the waste liquid supply tank 200 to the evaporation container 300.

On the other hand, the waste liquid supply passage 400 is provided with a pressure regulating passage 460 for controlling the waste liquid supply flow rate.

The pressure regulating passage 460 serves to regulate the pressure in the waste liquid supply passage 400 so that the waste liquid supply flow rate by the waste liquid supply pump 450 can be maintained constant.

The pressure regulating passage 460 is provided between a waste liquid supply passage 400 and a waste liquid feed pipe S for providing a pipe through which waste liquid is supplied from the waste liquid generating source to the waste liquid feed water tank 200.

At this time, a valve 461 for adjusting the opening and closing amount of the flow path is provided in the pressure control flow path 460.

With this configuration, the pressure of the waste liquid feed pump 450 operated in the waste liquid feed passage 400 can be controlled by the amount of opening and closing of the pressure control line 460, The waste liquid supply flow rate can be varied.

Next, the heater serves to heat and evaporate the waste liquid supplied into the evaporation vessel, and is installed at one side of the evaporation vessel.

At this time, the heater 500 directly heats the waste liquid, and it is preferable that the heater 500 is provided with a charging heater.

This is to increase the heating efficiency of the waste liquid, and to facilitate maintenance such as inspection and replacement of the heater 500.

Next, the waste liquid circulating flow path serves to circulate the waste liquid in the vaporizing container between the heater and the vaporizing container.

The waste liquid is directly contacted to the heater 500 through the waste liquid circulating passage 600 and heated, and then flows into the evaporation vessel 30). Thus, the efficiency of the waste liquid evaporation operation can be increased , The phenomenon of Dolby phenomenon and carryover in the evaporation vessel 300 can be prevented.

The waste liquid circulation passage 600 is installed between the evaporation vessel 300 and the heater 500. The waste liquid circulation passage 600 is provided with a waste liquid circulation pump 600 for providing a circulation force to the waste liquid in the evaporation vessel 300 610).

Next, the condenser 700 serves to condense and convert the waste heat exchanged steam into condensed water.

To this end, a steam supply passage 710 through which heat-exchanged steam is supplied to the condenser is installed between the condenser 700 and the heat exchanger 430.

The condenser 700 is provided with a discharge passage 720 through which steam generated by condensation of condensed water is discharged.

At this time, the flow path 720 is provided with a flow meter 721 for measuring the discharge amount of condensed water.

Further, it is preferable that a condensate conduction meter 722 for measuring the quality of the discharged condensed water is further installed in the discharge channel 720.

Next, the condensate water tank 800 stores the condensed water discharged from the condenser 700 and discharges the condensed water to a separate facility.

The condensate tank 800 is connected to the discharge passage 720.

Next, the condensate circulation passage 900 serves to reduce the pressure of the evaporation vessel 300, and is installed between the condensate tank 800 and the discharge passage 720.

At this time, an aspirator 910 is installed in the condensate circulation passage 900.

In addition, a condensate circulation pump 920 is installed in the condensate circulation passage 900 to generate power for circulating the condensed water.

At this time, a condensate discharge pipe 930 is installed on one side and the other side of the condensate circulation passage 900, and a valve 940 is provided between the condensate circulation passage 900 and the condensed water discharge pipe 930 to open and close the pipeline.

On the other hand, a cleansing water supply passage 950 may be provided in the condensate discharge pipe 930 on one side.

The cleaning water supply channel 950 is used to clean system equipment using condensed water, and the condensed water discharged through the condensed water discharge pipe 930 can be branched into the system equipment to perform a cleaning operation.

Hereinafter, the operation of the evaporation and drying system of the radioactive liquid waste constructed as described above will be described.

The waste liquid supply pipe S is opened to store the waste liquid in the waste liquid supply tank 200 from the waste liquid generation source.

Next, the waste liquid supply pump 450 is operated to transfer the waste liquid of the waste liquid supply water tank 200 to the evaporation container 300.

At this time, the flow rate of the waste liquid supplied through the waste liquid supply passage 400 can be adjusted by the opening / closing amount of the pressure control flow path 460.

At this time, the waste liquid supply flow rate is set to coincide with the condensate water flow rate, and the current level of the waste liquid in the evaporation vessel 300 is compared with the waste liquid level set so as to be in conformity with the condensate flow rate through the radar type water level meter 330, The flow rate of the waste liquid supplied through the pressure control flow path 460 is increased or decreased.

Accordingly, during the evaporation operation, the waste liquid is supplied at a substantially constant flow rate, so that the level of the waste liquid in the evaporation vessel 300 is kept constant.

The waste liquid conveyed along the waste liquid supply passage 400 is heat-exchanged through the heat exchanger 430 and then flows into the evaporation vessel 300 by the above-described series of processes.

At this time, the waste liquid flows into the evaporation vessel 300 after the temperature is raised through the heat exchanger 430, and the evaporation action is performed. Thus, the efficiency of evaporation can be increased and the heat energy that is already evaporated is evaporated. .

 The thermal energy of the heat exchanger 430 is a high temperature steam generated during the evaporation operation in the evaporation vessel 300. The steam is supplied from the evaporation vessel 300 to the heat exchanger 430 through the steam energy recovery channel 440 Flow.

Hereinafter, the operation of evaporation and drying operation in the evaporation vessel 300 will be described.

The waste liquid which has been heat-exchanged through the heat exchanger 430 and then flows into the evaporation vessel 300 is heated by being pumped by the waste liquid circulation pump 610 through the waste liquid circulation passage 600 .

Thereafter, the heated waste liquid flows back into the evaporation vessel 300 through the waste liquid circulation passage 600, and this process is repeatedly performed to evaporate the waste liquid.

On the other hand, as the band heater 310 heats the lower surface of the evaporation vessel 300, the evaporation effect is increased, and the waste liquid is evaporated and the remaining evaporation residue is dried.

At this time, the dried solids are discharged through the discharge part 320 of the evaporation vessel 300 and transferred to a separate treatment facility.

Meanwhile, in the process of evaporation operation in the evaporation container 300, the solids exfoliation device 340 is operated.

As the rotating shaft 342 is rotated by the driving unit 341, the peeling blade 343 rotates while closely contacting the inner surface of the evaporation vessel 300.

At this time, the solid matter adsorbed on the inner surface of the evaporation vessel 300 is peeled from the inner side surface of the evaporation vessel 300 by the peeling blade 343.

Since the rotational force load of the driving unit 341 is continuously monitored by the torque measuring unit 341a, the degree of concentration of the solid material due to evaporation of the waste liquid can be recognized through the measurement by the torque measuring unit 341a, It is possible to grasp the operation end point of time.

Next, the continuous evaporation operation is performed as described above, and the steam heat-exchanged in the heat exchanger 430 is supplied to the condenser 700 through the steam supply passage 710.

Thereafter, the steam is converted into condensed water through the condenser 700, and then discharged through the discharge channel 720.

In this case, the amount of discharged condensed water is measured through the flow meter 721. When a deviation occurs between the waste liquid supply flow rate and the condensed water discharge amount measured through the flow meter 420 of the waste liquid supply passage 400, the pressure control flow path 460 is controlled, Increase or decrease the supply.

Also, the discharged condensed water is measured by the condensate conductivity meter 722, and the condensed water management can be efficiently performed according to the water quality measurement.

Next, the condensed water discharged through the discharge channel 720 is stored in the condensed water tank 800 and then processed.

Meanwhile, depressurization operation of the evaporation vessel 300 is possible by circulating the condensed water stored in the condensate tank 800.

The condensing water circulation pump 920 is operated to reduce the boiling point of the waste liquid by reducing the boiling point of the evaporation vessel 300 to increase the energy efficiency and circulate the condensed water in the condensing water tank 800 along the condensing water circulation passage 900 .

At this time, the condenser water circulation passage 900 controls the valve 940 installed in the condensate water circulation passage 900 to form a flow path to the aspirator 910, so that the pressure can be reduced.

The decompression operation using the aspirator 910 is a known technique, and a detailed description thereof will be omitted.

At this time, when the condensate discharge is required during the depressurization operation of the evaporation vessel 300, the valve 940 is controlled to change the flow path to the condensate discharge pipe 930 so that the condensed water can be discharged through the condensate discharge pipe 930.

This completes the treatment of the radioactive liquid waste by evaporation and drying.

Meanwhile, the waste liquid may leak from the waste liquid supply tank 200 or the evaporation vessel 300 during the above-described series of processes, and the waste liquid falls to the bottom of the storage tank 100.

Thereafter, when the waste liquid flows into the collecting grooves 111 and the level of the waste liquid in the collecting grooves 111 reaches a predetermined level or more, the level gauge 112 senses the waste water to operate the waste liquid collecting pump 130, Is collected in the waste liquid supply water tank 200.

Meanwhile, the above-described system for evaporating and drying the waste liquid waste may be fixedly operated at a specific place, or may be installed movably in a container structure.

That is, the radioactive liquid waste evaporation and drying system may be provided in a movable type, which is installed in a container structure of a type that can be loaded on a vehicle, and may be moved to a required place and operated.

As described above, the system for the evaporation and drying of the radioactive liquid waste according to the present invention is characterized in that the radioactive waste liquid is treated through evaporation and drying so that the waste liquid circulates through the external heater to evaporate, There is a technical feature that the waste liquid can be evaporated after the waste liquid is preheated by using steam.

Accordingly, the evaporation operation can be performed stably and the energy consumption for the evaporation operation can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

100: storage tank 110: bottom surface
111: Water collecting groove 112,330: Water level meter
120: step 130: waste liquid collection pump
140: Waste liquid recovery flow channel 200: Waste liquid supply water tank
300: evaporation vessel 310: band heater
320: discharging part 340: solids peeling device
341: driving part 341a: torque measuring instrument
342: rotating shaft 343: peeling blade
400: waste liquid supply flow path 410,461,940: valve
420,721: Flow meter 430: Heat exchanger
440: Steam energy recovery channel 450: Waste liquid supply pump
460: Pressure regulating passage 500: Heater
600: waste liquid circulation flow path 610: waste liquid circulation pump
700: condenser 710: steam supply line
720: Exhaust flow path 722: Condensate conduction meter
800: Condensate tank 900: Condensate circulation flow path
910: Aspirator 920: Condensate circulation pump
930: Condensate discharge pipe 950: Cleansing water supply channel
S: Waste water supply and demand organ

Claims (9)

A waste liquid supply tank in which a radioactive waste liquid is stored;
An evaporation vessel in which the radioactive waste liquid is evaporated and dried;
A waste liquid supply passage provided between the waste liquid supply tank and the evaporation container and including a waste liquid supply pump;
A heater installed at one side of the evaporation vessel;
And a waste liquid circulation channel provided between the evaporation vessel and the heater and circulating the radioactive waste liquid in the evaporation vessel to the heater and the evaporation vessel,
The waste liquid supply tank and the evaporation vessel are installed in a storage tank,
The storage tank is provided with a collection groove for collecting the waste liquid supply water tank and the radioactive waste liquid leaked from the evaporation container rotor,
A waste liquid recovery flow path provided between the collection groove and the waste liquid supply tank;
A water level meter for measuring the water level of the collection groove;
And a waste liquid recovery pump for recovering the radioactive waste liquid in the collection groove through the waste liquid recovery flow path when the water level exceeds a certain level through the measurement of the water level meter. The method according to claim 1,
A pressure regulating passage is provided between the waste liquid supply passage and the waste liquid supply water tank, and a valve for controlling the amount of opening and closing of the pressure regulating passage is provided in the pressure regulating passage. 3. The method according to claim 1 or 2,
On the waste liquid feed path,
Further comprising a heat exchanger for heat-exchanging the temperature of the radioactive waste liquid supplied from the waste liquid supply water tank. The method of claim 3,
Wherein a steam energy recovery passage is provided between the heat exchanger and the evaporation vessel and the heat exchange action of the heat exchanger is performed using high temperature steam supplied through the steam energy recovery passage. 5. The method of claim 4,
A condenser installed at one side of the evaporation vessel;
A steam supply passage provided between the condenser and the heat exchanger and providing a conduit through which the heat-exchanged steam is sent to the condenser;
And a discharge flow path through which the condensed water generated from the condenser is discharged. 6. The method of claim 5,
A condensate tank connected to the discharge passage;
A condensate circulation pump for connecting the condensed water tank to the discharge passage and for circulating the condensed water in the condensed water tank;
And an aspirator provided in the discharge flow path and the condensate circulation flow path. 3. The method according to claim 1 or 2,
Wherein the evaporation vessel is provided with a radar type water level meter for measuring the level of the radioactive waste liquid. delete 3. The method according to claim 1 or 2,
And a band heater is installed below the outer circumferential surface of the evaporation vessel.

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CN112722624A (en) * 2020-12-07 2021-04-30 广东电网有限责任公司佛山供电局 Laboratory waste liquid automatic transfer device
CN113963833A (en) * 2021-11-30 2022-01-21 中国原子能科学研究院 Heat pump evaporation treatment system and method for radioactive waste liquid treatment
KR102563540B1 (en) 2022-02-16 2023-08-04 (주)나일프렌트 Drying system for waste material

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CN112722624A (en) * 2020-12-07 2021-04-30 广东电网有限责任公司佛山供电局 Laboratory waste liquid automatic transfer device
CN113963833A (en) * 2021-11-30 2022-01-21 中国原子能科学研究院 Heat pump evaporation treatment system and method for radioactive waste liquid treatment
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KR102563540B1 (en) 2022-02-16 2023-08-04 (주)나일프렌트 Drying system for waste material

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